Has there actually been any new cure for diseases in the last 3 decades?

Specifically talking about the US. I feel like the entire Healthcare system is built on "treating" or "managing" diseases but never curing it. Its like they'll keep you from dying, but never be healthy so that you'll forever pay the bills. Call me a conspiracy theorist but im guessing if anyone comes up with a cure for cancer or diabetes or anything it would be abroad, and if its in america they'll be assassinated because the powers that be will never allow cures to be possible since cash flow would stop. They need you DEPENDENT on the system forever.

Like has any real CURE for any common diseases been invented in the last 3 decades that became widespread in the US that you guys know of?